1 files changed, 5 insertions, 1 deletions
diff --git a/src/H5B.c b/src/H5B.c
index a27a444..43051ca 100644
--- a/src/H5B.c
+++ b/src/H5B.c
@@ -2120,7 +2120,11 @@ H5B_assert(H5F_t *f, const haddr_t *addr, const H5B_class_t *type,
 
     FUNC_ENTER(H5B_assert, FAIL);
     if (0==ncalls++) {
-	fprintf(stderr, "H5B: debugging B-trees (expensive)\n");
+	if (H5DEBUG(B)) {
+	    fprintf(H5DEBUG(B), "H5B: debugging B-trees (expensive)\n");
+	} else {
+	    fprintf(stderr, "H5B: debugging B-trees (expensive)\n");
+	}
     }
     /* Initialize the queue */
     bt = H5AC_find(f, H5AC_BT, addr, type, udata);